The document discusses the concept of base effect as it relates to inflation rates. It provides an example showing that even if prices do not change from one period to the next, reported inflation can be higher due simply to a lower base rate of inflation in the previous year. Specifically, if the inflation rate was 5% last year but 10% the year before, the inflation rate this year could be reported as higher than 5% even with no price changes, due to the lower base of the earlier year. In other words, base effect refers to how inflation in the corresponding period of the previous year can impact reported inflation figures today.
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Base effect
1. The annual Wholesale Price Index-based inflation rate fell in the
first week of June, the first time in well over three decades,
mainly on account of a statistical base effect.
So what is this base effect?
BASE EFFECT
To understand base effect, we need to revisit Inflation to
understand its implication.
4. Inflation is the ‘rate of change’ of prices.
If for a certain week, the inflation figure is at 12%,
it means the price index is 12% higher as compared
to the corresponding week in the previous year.
BASE EFFECT
5. BASE EFFECT
Here’s an example…
To explain base-effect:
Week 30 2008 - index was at 100 (100 is just an example).
Week 31 2008 - index was at 98.
Week 30 2009 - index is at 112.
Thus, inflation is 12% (denoting a 12% increase in prices).
6. BASE EFFECT
Now
Week 31 2009 - index continues to be at 112.
So as compared to the base exactly one year ago (week 31 2008) inflation
would be at 14.29% [(112 -98)/98 ]*100
Now though the index continued to be the same as what it was in week 30
of 2009, the inflation went up as the corresponding base was lower
in the previous year.
So even if the prices of the goods that represent the index did not change
as compared with the previous week ( i.e. week 31- 2009 over week 30-
2009), the inflation figure changed due to the effect of the previous year.
This is the base-effect for inflation.
7. BASE EFFECT
Which means..
Every reported inflation number is with reference to the inflation
number that existed exactly one year back re-based to 100
To make it more simple, if we say inflation is 5%, it means that if
the price of goods comprising the inflation basket was 100
exactly a year back, it is 105 today.
8. BASE EFFECT
To sum up
The base effect relates to inflation in the corresponding period of the
previous year:
Thus if the inflation rate was too low in the corresponding period of the
previous year, even a smaller rise in the Price Index will arithmetically give a
high rate of inflation now.
On the other hand, if the inflation rate was too high in the corresponding
period of the previous year a large price rise might land up presenting itself
as minor rise in inflation due to the base effect.
Thus the term ‘base effect’ has a lot of impact while ascertaining inflation
numbers and can sometimes appear to misrepresent ground realities
because it is dependant on a number that existed one year back.
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